Anxiously waiting for it to fall apart

[dejavu2]

Why is communication so hard? H is speaking with the children almost daily - yeah! However is struggling to find a form of communication (email, text or call) that he feels he can do with me. I am not asking him emotional questions, most involve routine things. I treat emails/texts like business.

Examples - We are meeting up for a family vacation next week. I gave him a detailed schedule of all the travels and asked his plans. He finally responded, 'arrive sometime Friday night'.
He is talking in detail about vacation plans/activities with the kids, hasn't mentioned anything to me.
Won't address problems with our taxes.

I don't get it. Can't decide if he is doing this to wind me up or what. Stonewalling has been one of his go-to ways of controlling me.

He said he didn't want the kids in the middle and he wants to work with a mediator on the divorce rather than solicitors. However, his lack of communication seems to doing just the opposite.